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ntfs: use bitmap_weight 

Use bitmap_weight() instead of doing hweight32() for each u32 element in
the page.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Anton Altaparmakov <aia21@cantab.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Akinobu Mita 2010-03-15 00:35:00 -04:00 committed by Linus Torvalds
parent bcc54e2a6d
commit c4af96449e
1 changed files with 13 additions and 12 deletions
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25
fs/ntfs/super.c
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@ -31,6 +31,7 @@
#include <linux/vfs.h> #include <linux/vfs.h>
#include <linux/moduleparam.h> #include <linux/moduleparam.h>
#include <linux/smp_lock.h> #include <linux/smp_lock.h>
#include <linux/bitmap.h>
#include "sysctl.h" #include "sysctl.h"
#include "logfile.h" #include "logfile.h"
@ -2458,7 +2459,6 @@ static void ntfs_put_super(struct super_block *sb)
static s64 get_nr_free_clusters(ntfs_volume *vol) static s64 get_nr_free_clusters(ntfs_volume *vol)
{ {
s64 nr_free = vol->nr_clusters; s64 nr_free = vol->nr_clusters;
u32 *kaddr;
struct address_space *mapping = vol->lcnbmp_ino->i_mapping; struct address_space *mapping = vol->lcnbmp_ino->i_mapping;
struct page *page; struct page *page;
pgoff_t index, max_index; pgoff_t index, max_index;
@ -2477,7 +2477,8 @@ static s64 get_nr_free_clusters(ntfs_volume *vol)
ntfs_debug("Reading $Bitmap, max_index = 0x%lx, max_size = 0x%lx.", ntfs_debug("Reading $Bitmap, max_index = 0x%lx, max_size = 0x%lx.",
max_index, PAGE_CACHE_SIZE / 4); max_index, PAGE_CACHE_SIZE / 4);
for (index = 0; index < max_index; index++) { for (index = 0; index < max_index; index++) {
unsigned int i; unsigned long *kaddr;
/* /*
* Read the page from page cache, getting it from backing store * Read the page from page cache, getting it from backing store
* if necessary, and increment the use count. * if necessary, and increment the use count.
@ -2490,16 +2491,16 @@ static s64 get_nr_free_clusters(ntfs_volume *vol)
nr_free -= PAGE_CACHE_SIZE * 8; nr_free -= PAGE_CACHE_SIZE * 8;
continue; continue;
} }
kaddr = (u32*)kmap_atomic(page, KM_USER0); kaddr = kmap_atomic(page, KM_USER0);
/* /*
* For each 4 bytes, subtract the number of set bits. If this * Subtract the number of set bits. If this
* is the last page and it is partial we don't really care as * is the last page and it is partial we don't really care as
* it just means we do a little extra work but it won't affect * it just means we do a little extra work but it won't affect
* the result as all out of range bytes are set to zero by * the result as all out of range bytes are set to zero by
* ntfs_readpage(). * ntfs_readpage().
*/ */
for (i = 0; i < PAGE_CACHE_SIZE / 4; i++) nr_free -= bitmap_weight(kaddr,
nr_free -= (s64)hweight32(kaddr[i]); PAGE_CACHE_SIZE * BITS_PER_BYTE);
kunmap_atomic(kaddr, KM_USER0); kunmap_atomic(kaddr, KM_USER0);
page_cache_release(page); page_cache_release(page);
} }
@ -2538,7 +2539,6 @@ static s64 get_nr_free_clusters(ntfs_volume *vol)
static unsigned long __get_nr_free_mft_records(ntfs_volume *vol, static unsigned long __get_nr_free_mft_records(ntfs_volume *vol,
s64 nr_free, const pgoff_t max_index) s64 nr_free, const pgoff_t max_index)
{ {
u32 *kaddr;
struct address_space *mapping = vol->mftbmp_ino->i_mapping; struct address_space *mapping = vol->mftbmp_ino->i_mapping;
struct page *page; struct page *page;
pgoff_t index; pgoff_t index;
@ -2548,7 +2548,8 @@ static unsigned long __get_nr_free_mft_records(ntfs_volume *vol,
ntfs_debug("Reading $MFT/$BITMAP, max_index = 0x%lx, max_size = " ntfs_debug("Reading $MFT/$BITMAP, max_index = 0x%lx, max_size = "
"0x%lx.", max_index, PAGE_CACHE_SIZE / 4); "0x%lx.", max_index, PAGE_CACHE_SIZE / 4);
for (index = 0; index < max_index; index++) { for (index = 0; index < max_index; index++) {
unsigned int i; unsigned long *kaddr;
/* /*
* Read the page from page cache, getting it from backing store * Read the page from page cache, getting it from backing store
* if necessary, and increment the use count. * if necessary, and increment the use count.
@ -2561,16 +2562,16 @@ static unsigned long __get_nr_free_mft_records(ntfs_volume *vol,
nr_free -= PAGE_CACHE_SIZE * 8; nr_free -= PAGE_CACHE_SIZE * 8;
continue; continue;
} }
kaddr = (u32*)kmap_atomic(page, KM_USER0); kaddr = kmap_atomic(page, KM_USER0);
/* /*
* For each 4 bytes, subtract the number of set bits. If this * Subtract the number of set bits. If this
* is the last page and it is partial we don't really care as * is the last page and it is partial we don't really care as
* it just means we do a little extra work but it won't affect * it just means we do a little extra work but it won't affect
* the result as all out of range bytes are set to zero by * the result as all out of range bytes are set to zero by
* ntfs_readpage(). * ntfs_readpage().
*/ */
for (i = 0; i < PAGE_CACHE_SIZE / 4; i++) nr_free -= bitmap_weight(kaddr,
nr_free -= (s64)hweight32(kaddr[i]); PAGE_CACHE_SIZE * BITS_PER_BYTE);
kunmap_atomic(kaddr, KM_USER0); kunmap_atomic(kaddr, KM_USER0);
page_cache_release(page); page_cache_release(page);
} }